Pressboard



Patented June 11, 1935 UNITED YSTATES PATENT o OFFICE y 2,004,710@ l" ye PREssoAnn Henry Sieb,k Hammond, Ind. Application September 1,1934,Serial No. 742,383

s claims.

In 'the manufacture of books having stiff, boardlike covers, they areplaced between press boards having projecting ribsy or ledges along theedges and are subjected to heavy pressure, inthe proc- A ess of applyingand pasting on the covers; the

ribs or ledges of the boardsbeing placed just behind the rear edges ofthe stiiening boards or cores of the covers, whereby grooves ordepressions, forming thehinges for the covers, will be produced. In theold style books the stitches holding the leaves of a book'togetherare'at the veryl back, so that the hinge Yaxes of the leaves are to therear of the plane containing the hingel axes of the two covers.'Therefore, only veryl narrow hinged grooves or depressionsareuneededr inthe covers of the old books, and the ribs 'or'- ledges may be simpleflat metal strips vwider thanv the thickness of the boards properarranged on edge and secured to and following along the edges of thepress boards. f' Y 'i In the modern type of bookin which the leaves aresecured together by stitches passing "entirely through the body of thebook,l at some distance from the rear edge and atvright angles to thebroad faces of the book, the hingesfor the leaves and the hinges for thecoversarein the same plane and, therefore, the hinge -sectionsv of thecovers mustv be made wide. Consequently, the ribs or ledges on the pressboards should be made much wider or thicker than for the old style oflbooks. However, when thick metal strips are secured to the edges of thepress boards, being held in place by means of many screws, the boardsfrequently split and become useless. In any event, even in the case ofthe older, thinner strips, it is not easy to fasten the strips to theboards so that the projection of a strip above and below the broad facesof a board will be equal in extent and be uniform on each facethroughout the length of the strip. Because of the trouble encounteredin the use of thick strips it is now the custom to employ press boardshaving only thin edge strips, in applying the covers to the said moderntype of book, with the result that the pasting at the hinges is noteffectively done and the covers often come loose.

The object of the present invention is to produce a press board providedwith pressure ribs or ledges of a novel form which may be of any desiredwidth, be easily applied and which, when applied, will be accuratelypositioned and will serve to strengthen the board instead of weakeningit. Y

In carrying out my invention, I employ a body member of any usual orsuitable construction,

lfore, reenforce and strengthen the wooden panel 'instead of subjectingit to stresses that tend to split it or break it apart. 'Y f In ordertok reduce the' amount of splitting of boards of thev old type ithasbeen necessaryto .make them very thick. Since my improved boardis'subjected only to compression stresses and not to stresses tending tosplit`it,`asis the case with boards to which heavy stresses may betransmitted through the holding screws for the edge strips, it may bemade much thinner than the. old type of board. For example, whereas aboard o of the old type would -have a thickness of fromv seveneighths ofan inch to an inch, my improvedv board 'need be only, say, half van inchthick. It willthusbe evident that in building up a stack of booksinterspersed with press boards, more books may be placedl in a stackadapted to be compressed in al press having anopening of a given height,and more books can be Lpressed. at one time, where my improved boards'are used, than is the case where boards made in the old way areemployed. Y Y

Therefore, viewed in one of its "aspects, the present invention vmay besaid to have for its objject to-Yproduce a novel type of press boardwhichshall make it possible to arrange more books, than heretofore, in astack of given height composed of books alternating with press boards,and thus permit a larger number of books to be operated upon at one timein a press than could be done by using press boards of the old type.

The various features of novelty whereby my invention is characterizedwill hereinafter be pointed out with particularity in the claims; but,for a full understanding of my invention and of its objects andadvantages, reference may be had to the following detailed descriptiontaken in connection with the accompanying drawing,

whereinz' Figure l is a plan View of one of my improved press boards;Fig. 2 is an edge view; Fig. 3 is a section, on a much larger scale,through a book and two press boards between which it lies, showingfragments only of the book and board, the

' section with respect to the pressboards being on line 3-3 of Fig. 1;Fig.'4 is a view, on a much larger scale, similar to Fig. 1, showingonly a corner fragment; Fig; is a `view similar to Fig. 4,

the metal rim or frame being in section; and Fig. 6 is a section on line6 6 of Fig. 5. K Y

`Referring to the drawing, I represents a panel of wood, preferablyplywood, there being ve plies Yinthe panel illustrated.' This panel,which is `of any usual or desired length, breadth and thickness, is setinto a frame 2 consisting of metal, preferably stainless steel,channel-shaped in cross section; the frame extending along all fouredges of the panel and receiving the marginal portions thereof in thechannel or trough o'f the .frame. The width of the trough or channel inthe frame is, therefore, such that the panel will be a snug t therein,whereby the Yflanges 3, 3`of the frame members rest solidly against thebroad faces of the panel. By this arrangement, any pressure on the frameat right angles tothe plane of the-boardV proper can be transmitted tothe panelV only as a force tending to vproduceY com-V pression and notasone that places the panel 4under tension. Consequently, the panel willnot crack lor be split by the stresses to which it is subjected while'inuse.v 'I'he width of the anges 3 is equal tothe depth of theYdepressions A to be produced inthe cover- Y of the kbook B,andthethicknessof the flanges is equal tothe depth ofV those depressions.

AIf desired the several membersof the'frame may be secured vto the panelby-a few fasteningsv as,

.v for example, a few screws 4; the only purpose` of y the fasteningsbeing to prevent the members of the frame-from being sprung inthe planeAof the board away from the edges. In other words, the

screws do not transmit any stresses between the panel and the frameduring an operationA of book pressing.

The frame may be applied to the wooden panel Vin any desired way,although I preferv to secure it in such a manner Vthat it may bedetached in the event that eitherthe frame or the Wooden meinber isdamaged and requires replacement. VIn the arrangement shown, the frameconsists of a single strip of channel, section, the flanges of VtheVchan-. nel being cut away atv the proper pointsto permit the stripY tobe bent into a rectangleA and bring about miter joints at the fourcorners. The, two ends of the strip meet at some distance from one ofthe corners, as shown in Figs. 1, 4 and 5. In

' order to secure the meeting ends of the strip together I place withinthe channel thereof, across the joint between such meetingfends, a metalblock 5. Each strip end is fastened to this block by a machine screw 6,these screws passing through the web sections of the channels. In orderto provideroom for the block I cut awayv a fragment at the correspondingcorner of the Wooden panel to provide aA notch T having a lengthsomewhat greaterrthan the block, but preferably of about the same depthas the thickness of the block. 'I he block, as best shown in Figs. 5 and6, Y

is arranged in this notch in the end of the board. It will thus be seenthat thev endsV of the strip are securely fastened together withoutrelying on the f holding effort of screws or the likeentered into thewood, so that the integrity of the rim or frame does not depend upon theWooden member'of the board. By removingV the machine screws 6 and thewood screws 4, the rim or frame may be detached without injury to itselfor to the wooden ,Y

panel.

In using my improved boards they are assembled in the usual way withinterposed books in Y stackV formation, the adjacent frame elementsabove and below each book being set in registration with the throughstitching C, 'as shown in Fig. 3. The stack is then placed underpressure in the usual way. f Y g i g While I have illustratedand'described withV particularity onlya single preferred form ofjmyinvention,V I do not desire Ato be vlimited to the exact structuralVdetails thus illustrated and de scribed; but intend to cover all formsand arrangements which comewithin thedenitions of my inventionconstituting the appended claims. f I claim: v v :5115A"PIeSScbQardcomposed of awooden panel land 1 a channeleshaped vframe surrounding thesame; thevpanel being `set at itsgedges yintothe channeljin theframe.YV

Y 2. A press board composedfof a wooden 'panel and a channel-shapedframe Asurrounding the same, the panel being set atitS-edges into thechannel in the frame, theY width ofthe flanges of the framemember beinggreater than'thethickness ofthe metal in said member. l

V3. A press board composed of a wooden panel and a Vchannelshaped framesurrounding the same, thev panel being set at its edgesvinto thechannelV or trough of the frame, said frame Ibeing in the form of a.strip whose ends meet in a butt joint, a metal block set in the channelor trough of the frame acrosssaid joint, and fastenings ex-v tendinginto the block through the web sections of the frame on opposite sidesof the joint, said wooden panel having an edge notch in which said blocklies. i

f VHENRY SIEB.

